mirror of https://github.com/acidanthera/audk.git
86 lines
2.5 KiB
ArmAsm
86 lines
2.5 KiB
ArmAsm
#------------------------------------------------------------------------------
|
|
#
|
|
# Copyright (c) 2006, Intel Corporation
|
|
# All rights reserved. This program and the accompanying materials
|
|
# are licensed and made available under the terms and conditions of the BSD License
|
|
# which accompanies this distribution. The full text of the license may be found at
|
|
# http://opensource.org/licenses/bsd-license.php
|
|
#
|
|
# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
|
|
# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
|
|
#
|
|
# Module Name:
|
|
#
|
|
# CopyMem.asm
|
|
#
|
|
# Abstract:
|
|
#
|
|
# CopyMem function
|
|
#
|
|
# Notes:
|
|
#
|
|
#------------------------------------------------------------------------------
|
|
|
|
.globl ASM_PFX(InternalMemCopyMem)
|
|
|
|
#------------------------------------------------------------------------------
|
|
# VOID *
|
|
# EFIAPI
|
|
# InternalMemCopyMem (
|
|
# IN VOID *Destination,
|
|
# IN VOID *Source,
|
|
# IN UINTN Count
|
|
# );
|
|
#------------------------------------------------------------------------------
|
|
ASM_PFX(InternalMemCopyMem):
|
|
push %esi
|
|
push %edi
|
|
movl 16(%esp), %esi # esi <- Source
|
|
movl 12(%esp), %edi # edi <- Destination
|
|
movl 20(%esp), %edx # edx <- Count
|
|
leal -1(%esi,%edx,), %eax # eax <- End of Source
|
|
cmpl %edi, %esi
|
|
jae L0
|
|
cmpl %edi, %eax # Overlapped?
|
|
jae L_CopyBackward # Copy backward if overlapped
|
|
L0:
|
|
xorl %ecx, %ecx
|
|
subl %edi, %ecx
|
|
andl $15, %ecx # ecx + edi aligns on 16-byte boundary
|
|
jz L1
|
|
cmpl %edx, %ecx
|
|
cmova %edx, %ecx
|
|
subl %ecx, %edx # edx <- remaining bytes to copy
|
|
rep
|
|
movsb
|
|
L1:
|
|
movl %edx, %ecx
|
|
andl $15, %edx
|
|
shrl $4, %ecx # ecx <- # of DQwords to copy
|
|
jz L_CopyBytes
|
|
addl $-16, %esp
|
|
movdqu %xmm0, (%esp)
|
|
L2:
|
|
movdqu (%esi), %xmm0
|
|
movntdq %xmm0, (%edi)
|
|
addl $16, %esi
|
|
addl $16, %edi
|
|
loop L2
|
|
mfence
|
|
movdqu (%esp),%xmm0
|
|
addl $16, %esp # stack cleanup
|
|
jmp L_CopyBytes
|
|
L_CopyBackward:
|
|
movl %eax, %esi # esi <- Last byte in Source
|
|
leal -1(%edi,%edx,), %edi # edi <- Last byte in Destination
|
|
std
|
|
L_CopyBytes:
|
|
movl %edx, %ecx
|
|
rep
|
|
movsb
|
|
cld
|
|
movl 12(%esp), %eax # eax <- Destination as return value
|
|
pop %edi
|
|
pop %esi
|
|
ret
|